Obtaining Maximum Performance
The DF140A/115A/100A utilize an enhanced air intake system that maximizes airflow into the engine to obtain greater
power output. In order for this system to achieve full potential, greater exhaust efficiency is required as well, so the
engines are designed with an efficient "4 into 2 into 1" exhaust system that reduces drag in the exhaust letting it flow
smoothly out of the cylinders. This design increases low to mid-range torque on these outboards and provides the wide
powerband that boaters want.
The DF140A/115A/100A also feature a two-stage reduction gear that delivers the torque needed to turn a large diameter
propeller. This is normally done using larger gears or a larger gearbox, but Suzuki has long employed a two-stage system
that provides the required torque without adding unwanted bulk or weight to the engine. With a final drive ratio of
2.59, these outboards produce plenty of torque for quick acceleration.
Both models also feature a two-stage reduction gear that delivers a larger gear ratio of 2.59. On the drive shaft, the
first stage reduction delivers a ratio of 1.24 while the second stage, in the gear case itself, delivers a further
reduction of 2.08. The biggest gain this system delivers is in its capability to use a highly efficient, large pitch,
large diameter propeller.